Question

In the figure 29-40, two long
straight wires are perpendicular to the page and separated by
distance d1 = 0.75 cm. Wire 1 carries 8.4 A into the page. What is
the current in wire 2 (in A) if the net magnetic field due to the
two currents is zero at point P located a distance d2 = 1.50 cm
from wire 2?